Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C

Autores
Benavidez, Edgardo; Brandaleze, Elena
Año de publicación
2020
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Thermal and structural characteristics of an alumina-spinel castable (containing 2.5 wt.% CaO) was studied. The specimens were cast (8.0 wt.% water), cured in air at ambient temperature (48 h), then dried at 100°C (24 h) and prefiring at 500°C (3 h). Thermal behavior was analyzed by dilatometries at constant heating rate (5°C/min) up to 1600°C, and at constant temperature (range: 1000-1500°C). Crystallographic phases were determined by XRD and microstructures were analyzed by SEM/EDS. Specimens heat treated at 1000°C and 1200°C showed Al2O3 (A) and MgAl2O4 (MA) as main phases. Between 1200-1300°C, the 2Al2O3∙CaO (CA2) formation is promoted. Calcium hexaluminate 6Al2O3∙CaO (CA6) is detected from 1400°C. The presence of CA6 increases at 1500°C and 1600°C. From dilatometric curves, alternating expansion contraction zones were observed in the range 1000-1600°C. This behavior is associated to (i) the CA2 and CA6 formation, and (ii) the sintering/densification of ceramic grains with probable liquid phase assistance. Thus, considering the temperature profile, generated in service, through this material, both the formation of CA2 and CA6 and the sintering evolution during the first hours, lead to volumetric contractions and expansions in different zones. These volumetric changes generate mechanical stresses that can cause faults in the material.
Fil: Benavidez, Edgardo. Universidad Tecnológica Nacional. Facultad Regional San Nicolás. Departamento de Ingeniería Metalúrgica. Centro DEYTEMA; Argentina.
Fil: Brandaleze, Elena. Universidad Tecnológica Nacional. Facultad Regional San Nicolás. Departamento Metalurgia. Centro DEYTEMA; Argentina.
Materia
castable
microstructure
dilatometry
XRD
Nivel de accesibilidad
acceso abierto
Condiciones de uso
2022-12-16T13:34:36Z
Repositorio
Repositorio Institucional Abierto (UTN)
Institución
Universidad Tecnológica Nacional
OAI Identificador
oai:ria.utn.edu.ar:20.500.12272/7411
Acceder
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network_acronym_str RIAUTN
repository_id_str a
network_name_str Repositorio Institucional Abierto (UTN)
spelling Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°CBenavidez, EdgardoBrandaleze, ElenacastablemicrostructuredilatometryXRDThermal and structural characteristics of an alumina-spinel castable (containing 2.5 wt.% CaO) was studied. The specimens were cast (8.0 wt.% water), cured in air at ambient temperature (48 h), then dried at 100°C (24 h) and prefiring at 500°C (3 h). Thermal behavior was analyzed by dilatometries at constant heating rate (5°C/min) up to 1600°C, and at constant temperature (range: 1000-1500°C). Crystallographic phases were determined by XRD and microstructures were analyzed by SEM/EDS. Specimens heat treated at 1000°C and 1200°C showed Al2O3 (A) and MgAl2O4 (MA) as main phases. Between 1200-1300°C, the 2Al2O3∙CaO (CA2) formation is promoted. Calcium hexaluminate 6Al2O3∙CaO (CA6) is detected from 1400°C. The presence of CA6 increases at 1500°C and 1600°C. From dilatometric curves, alternating expansion contraction zones were observed in the range 1000-1600°C. This behavior is associated to (i) the CA2 and CA6 formation, and (ii) the sintering/densification of ceramic grains with probable liquid phase assistance. Thus, considering the temperature profile, generated in service, through this material, both the formation of CA2 and CA6 and the sintering evolution during the first hours, lead to volumetric contractions and expansions in different zones. These volumetric changes generate mechanical stresses that can cause faults in the material.Fil: Benavidez, Edgardo. Universidad Tecnológica Nacional. Facultad Regional San Nicolás. Departamento de Ingeniería Metalúrgica. Centro DEYTEMA; Argentina.Fil: Brandaleze, Elena. Universidad Tecnológica Nacional. Facultad Regional San Nicolás. Departamento Metalurgia. Centro DEYTEMA; Argentina.Mind Authors Inc.2022-12-16T13:34:36Z2022-12-16T13:34:36Z2020-11-10info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciapdfapplication/pdfhttps://materialsinfo.mindauthors.com/nov-2020/http://hdl.handle.net/20.500.12272/7411enginfo:eu-repo/semantics/openAccess2022-12-16T13:34:36Zhttp://creativecommons.org/licenses/by-nc-nd/4.0/Attribution-NonCommercial-NoDerivatives 4.0 InternacionalLicencia CC BY NC NDreponame:Repositorio Institucional Abierto (UTN)instname:Universidad Tecnológica Nacional2026-09-24T12:44:23Zoai:ria.utn.edu.ar:20.500.12272/7411instacron:UTNInstitucionalhttp://ria.utn.edu.ar/Universidad públicaNo correspondehttp://ria.utn.edu.ar/oaigestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:a2026-09-24 12:44:24.216Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacionalfalse
dc.title.none.fl_str_mv Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
spellingShingle Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
Benavidez, Edgardo
castable
microstructure
dilatometry
XRD
title_short Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_full Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_fullStr Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_full_unstemmed Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
title_sort Structural evolution of an Al2O3-MgO•Al2O3 castable in the range 1000-1600°C
dc.creator.none.fl_str_mv Benavidez, Edgardo
Brandaleze, Elena
author Benavidez, Edgardo
author_facet Benavidez, Edgardo
Brandaleze, Elena
author_role author
author2 Brandaleze, Elena
author2_role author
dc.subject.none.fl_str_mv castable
microstructure
dilatometry
XRD
topic castable
microstructure
dilatometry
XRD
dc.description.none.fl_txt_mv Thermal and structural characteristics of an alumina-spinel castable (containing 2.5 wt.% CaO) was studied. The specimens were cast (8.0 wt.% water), cured in air at ambient temperature (48 h), then dried at 100°C (24 h) and prefiring at 500°C (3 h). Thermal behavior was analyzed by dilatometries at constant heating rate (5°C/min) up to 1600°C, and at constant temperature (range: 1000-1500°C). Crystallographic phases were determined by XRD and microstructures were analyzed by SEM/EDS. Specimens heat treated at 1000°C and 1200°C showed Al2O3 (A) and MgAl2O4 (MA) as main phases. Between 1200-1300°C, the 2Al2O3∙CaO (CA2) formation is promoted. Calcium hexaluminate 6Al2O3∙CaO (CA6) is detected from 1400°C. The presence of CA6 increases at 1500°C and 1600°C. From dilatometric curves, alternating expansion contraction zones were observed in the range 1000-1600°C. This behavior is associated to (i) the CA2 and CA6 formation, and (ii) the sintering/densification of ceramic grains with probable liquid phase assistance. Thus, considering the temperature profile, generated in service, through this material, both the formation of CA2 and CA6 and the sintering evolution during the first hours, lead to volumetric contractions and expansions in different zones. These volumetric changes generate mechanical stresses that can cause faults in the material.
Fil: Benavidez, Edgardo. Universidad Tecnológica Nacional. Facultad Regional San Nicolás. Departamento de Ingeniería Metalúrgica. Centro DEYTEMA; Argentina.
Fil: Brandaleze, Elena. Universidad Tecnológica Nacional. Facultad Regional San Nicolás. Departamento Metalurgia. Centro DEYTEMA; Argentina.
description Thermal and structural characteristics of an alumina-spinel castable (containing 2.5 wt.% CaO) was studied. The specimens were cast (8.0 wt.% water), cured in air at ambient temperature (48 h), then dried at 100°C (24 h) and prefiring at 500°C (3 h). Thermal behavior was analyzed by dilatometries at constant heating rate (5°C/min) up to 1600°C, and at constant temperature (range: 1000-1500°C). Crystallographic phases were determined by XRD and microstructures were analyzed by SEM/EDS. Specimens heat treated at 1000°C and 1200°C showed Al2O3 (A) and MgAl2O4 (MA) as main phases. Between 1200-1300°C, the 2Al2O3∙CaO (CA2) formation is promoted. Calcium hexaluminate 6Al2O3∙CaO (CA6) is detected from 1400°C. The presence of CA6 increases at 1500°C and 1600°C. From dilatometric curves, alternating expansion contraction zones were observed in the range 1000-1600°C. This behavior is associated to (i) the CA2 and CA6 formation, and (ii) the sintering/densification of ceramic grains with probable liquid phase assistance. Thus, considering the temperature profile, generated in service, through this material, both the formation of CA2 and CA6 and the sintering evolution during the first hours, lead to volumetric contractions and expansions in different zones. These volumetric changes generate mechanical stresses that can cause faults in the material.
publishDate 2020
dc.date.none.fl_str_mv 2020-11-10
2022-12-16T13:34:36Z
2022-12-16T13:34:36Z
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
format conferenceObject
status_str publishedVersion
dc.identifier.none.fl_str_mv https://materialsinfo.mindauthors.com/nov-2020/
http://hdl.handle.net/20.500.12272/7411
url https://materialsinfo.mindauthors.com/nov-2020/
http://hdl.handle.net/20.500.12272/7411
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
2022-12-16T13:34:36Z
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Licencia CC BY NC ND
eu_rights_str_mv openAccess
rights_invalid_str_mv 2022-12-16T13:34:36Z
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Licencia CC BY NC ND
dc.format.none.fl_str_mv pdf
application/pdf
dc.publisher.none.fl_str_mv Mind Authors Inc.
publisher.none.fl_str_mv Mind Authors Inc.
dc.source.none.fl_str_mv reponame:Repositorio Institucional Abierto (UTN)
instname:Universidad Tecnológica Nacional
reponame_str Repositorio Institucional Abierto (UTN)
collection Repositorio Institucional Abierto (UTN)
instname_str Universidad Tecnológica Nacional
repository.name.fl_str_mv Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacional
repository.mail.fl_str_mv gestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.ar
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